Questions tagged [beam]
Questions about the theory and applications of structural elements designed to resist bending.
233
questions
2
votes
1answer
68 views
Is the calculated shear strain in a beam, engineering strain or tensorial strain?
Recently I came across a FEM code of a linear deformation beam element, and it made me wonder what is the correct relation between shear stress and shear strain in a beam element.
In the beam element ...
1
vote
1answer
69 views
Finding Safety Factor for Plastic Snap Fit Cantilever
I'm trying to get a safety factor of $n\geq2$ for the root of my snap fit beam (pic at bottom of the post).
I have gone through the calculations to get the SF at the root's edge from the geometric ...
1
vote
0answers
56 views
On rectangular section beam properties of plate stiffeners
I am trying to understand the expression of the vertical dynamic stiffness $K_T$ and the rotational dynamic stiffness $K_r$ which appears in this paper where they consider a semi-infinite plate ...
3
votes
3answers
315 views
What are the units used in beam bending equations? Do they matter?
I was just wondering whether or not the standard beam bending equations worked for all units. E.g. imperial and metric etc.
From what I'm guessing it shouldn't really, since once we plug everything in ...
0
votes
2answers
84 views
Can a beam be too short to experience bending stress?
The question in the title says it all. I've got a a configuration where I'm using a bolt to support a load. The way its set up, the bolt will have a very short cantilever on it. When I calculate the ...
1
vote
1answer
61 views
Comparison of Shear Stress obtained from thin-walled beam theory and Timoshenko beam theory
I am studying the book "Structural Analysis with Applications to Aerospace Structures" by Craig. In Chapter 8 titled "Thin-Walled Beams", the authors derived the governing ...
0
votes
1answer
36 views
How to determine beam deflection with this unusual configuration (diagram attached)
So I've got a support system shown here in the attached image. Comparing configuration "A" to "B" it seems intuitive that "A" could support a larger load. The stubs are ...
2
votes
3answers
84 views
Is an axial force applied at the centre of a beam considered a compressive force, tensile force, or both?
I was looking through some course notes and realized that I never fully understood this concept. So, looking at the diagram below we can see that there is a 20kN axial force being applied in-between ...
1
vote
2answers
43 views
Where to place air, water and electric cables in a composite beam [closed]
If water, gas and electrical cables have to pass through three (3) openings
provided in the cross section shown in Figure 2, with tangible and scientific
arguments specify the adequate opening for ...
0
votes
2answers
56 views
Calculating the von mises stress in a 3D beam when given stresses and moments on both ends
I want to calculate the von mises stress in a given structural member. I want to generate a von-mises plot from this data.
The forces are according to the local coordinate system of the beam. Also, I ...
0
votes
1answer
31 views
Calculating the load on the end of a beam
We ordered a really nice light for our dinner table and ordered a special "lightswing" seperatly.
The light that we ordered however is heavier than the 'lightswing' is rated for.
Please see ...
0
votes
0answers
39 views
How to use standard aluminium extrusions
How to use standard aluminum extrusions and accessories at Solidworks? I believe there are some libraries, but I don't know how to click or download them. Would you please teach me how to do it? Thank ...
0
votes
2answers
75 views
Find out the forces in members (as mentioned in the figure) of the truss by method of sections [closed]
I'm trying to find the forces in every member. But having a hard time resolving it. The Problem is to be solved by the Method of Sections of Truss.
2
votes
1answer
61 views
How to design an enclosure around the load cell (Beam type)?
Hardware and Electronics Used: Arduino UNO, HX711 ADC Load cell amplifier, Load Cell (2Kg);
Currently, I am working on a project which requires me to put load cell along with the other circuitry in an ...
3
votes
3answers
139 views
Fun Force Problem - Basic Structure of Two beams supporting weight
I'm very new to engineering and thought I'd start with some basic problems and test them out with my own constructions! I've come up with this fun problem and would love some help solving it.
Say you ...
0
votes
0answers
22 views
Adding tension to a model of a Timoshenko beam?
I am interested in modeling a Timoshenko beam: https://en.wikipedia.org/wiki/Timoshenko%E2%80%93Ehrenfest_beam_theory
However, I would also like to add tension to the beam so that it can vibrate like ...
0
votes
1answer
55 views
How to calculate reaction moments and forces in a fixed axle with multiple point loads?
I need to calculate the maximum moment and reaction forces in an axle with both sides fixed in bearings, the axle is 1010mm long and has downwards forces of:
236kN at 403mm
86kN at 499mm
32kN at ...
0
votes
1answer
28 views
Diagrams of forces and moments of a statically determinate structure
I'm having difficulties with calculating the distribution of forces and moments in a statically determinate structure shown below.
I'm especially confused about the arc part. Will there be only ...
1
vote
4answers
104 views
Exactly what makes steel-concrete composite beam better than pure steel?
A composite action beam may have a concrete section the top, carrying the compression load, and steel at the bottom, carrying tension.
But I have always thought that concrete had lower strength for a ...
1
vote
3answers
76 views
How many support beams/rods needed for a firewood storage cabinet
I am building a firewood storage cabinet which should support around 100-150 kg of firewood.
The cabinet is made out of wooden boards (...
0
votes
3answers
148 views
Why is it said that the flange of an I beam carries most of the moment?
It is often said for I beams that the flange carries most of the moment subjected to the beam, while the web carries most of the shear force. The latter is obvious from pictures like above, showing ...
0
votes
1answer
47 views
Cantilever beam
I want to design a cantilever addition. Over the driveway so I can't add supports.
I want to use the calculator here
https://calcresource.com/moment-of-inertia-rect.html
But I'm having trouble ...
1
vote
1answer
29 views
If an airfoil underwent horizontal loading, would it stiffen the airfoil? [closed]
I am designing a wing for a Vertical Takeoff and Landing aircraft. I am trying to choose a wingtip winglet for my aircraft. One of the option is a aft-swept wingtip winglet. However, this structure ...
0
votes
1answer
55 views
Boundary conditions for a cantilevered Timoshenko Beam
I am trying to find out the boundary conditions for above given Timoshenko beam. The boundary conditions that I have derived are
$x_1 = 0$
$$ \overline{u}_2^L = 0 $$
$$ \phi_3^L = 0 $$
$x_1 = \...
0
votes
4answers
107 views
Deflection of a fixed-fixed pvc pipe under self weight
I would like to start by saying I am not an engineer, so I apologize if this question seems simpleminded.
I am making a manual tarp reel from pvc pipe, and I am trying to decided whether to use ...
0
votes
1answer
58 views
How to calculate the force of a cantilever beam at a given point of deflection?
I have put together a simple cantilever beam using finite difference modeling according to the following standard wave equation
$$ρAy_{tt} = -EIy_{xxxx}$$
where $ρ$ is density, $A$ is cross sectional ...
1
vote
1answer
65 views
Simple cantilever beam deflection - what is the simplest way to add a damper?
I am looking at a simple cantilever beam deflection:
I understand the general expression for deflection/force would be:
$$y_s = \frac{Fx_s^3}{3EI}$$
$$F_p = \frac{3y_sEI}{x_s^3}$$
If you were going ...
1
vote
2answers
98 views
Multiple varying cross section beam with uniform loads
I have the following cantilever beam problem where I need to find the deflection of the tip at P.
I tried to compute the deflection of the beam using Castignliano' s theorem as described in this ...
0
votes
3answers
79 views
Statically determinate system
The exercise is taken from linear algebra and its applications, prof. G. Strang
Exercise 2.4.8 Truss
I have already found that: m=n=8 → system is statically determinate, therefore solvable by ...
0
votes
0answers
13 views
double integration of continues beam to find the deflection at mid span [duplicate]
does any one know how to derive the deflection equation of a continues beam of three span of equal length and equal UDL load
some of the steps of this explanation I didn't understand it Here's a link ...
0
votes
0answers
42 views
Continues beam deflection
does any one know how to derive the deflection equation of a continues beam of three span of equal length and equal UDL load
Here's a link
these two pictures shows my tries to solve the question
1
vote
1answer
29 views
Derivaiton of maximum deflection of a cantilever beam with intermediate load
I am trying to derive the maximum deflection of a cantilever beam. L is the length of the beam and a is the where force is applied.
For the case 0<x<a, I use the method below and it gives me the ...
1
vote
3answers
126 views
How can deflection and spring constant of cantilever beam stack be calculated?
How can I calculate some properties of a stack of 2 bonded cantilever beams like in the image? Especially I am interested in the spring constant and deflection with force on random locations. However, ...
0
votes
0answers
28 views
Design of T-Beam
Please design a T-beam section size such that hf ≥ 125 mm, bw ≥ 200 mm, be ≥ 500 mm, d ≥ 300 mm, the concrete f'c strength is 25 MPa; the calculated concrete shear strength Vc that can be provided is ...
1
vote
1answer
92 views
How to check if bending moment diagram is correctly drawn
EDIT: I will state my test problem description and then my solution. But before that, I would like to apprise you of the absence of the actual description given during test (which happened in Zoom and ...
0
votes
1answer
40 views
Where does the equation for shear stress of a rectangular beam (3/2 V/A) come from?
I am writing a report and need to reference every equation used. I am using the equation for shear stress in a rectangular beam of
tau = 3/2 * V/A
but am not sure where it came from or what textbook ...
1
vote
1answer
99 views
What is meant by the rotation capacity of a cross section?
I'm reading about classification of beam cross sections here.
It is said:
The ratio of the ultimate rotation to the yield rotation is called the rotation capacity
of the section. The yield and the ...
0
votes
0answers
97 views
Large deflection of a non prismatic cantilever beam under distributed load
Here's what I got trying to calculate the large deflection of a cantilever beam with two different cross sections under a uniformly distributed load:
From the figure, the shear force is:
$$
V(s) = q(...
5
votes
1answer
82 views
“Heavy-duty” or not, can my drawer slides really support this weight?
Okay, so recently I got a Dewalt 735 Thickness Planer.
It's great at what it does. (It even LOOKS like it's ready to consume the tender flesh of lumber, like some twisted Victorian lumberjack... ...
2
votes
1answer
45 views
Steel beam size
I'm a customer not an engineer!
I had 2 sets of drawings for a project to put in bi fold doors.
The original drawing had a beam of 230mm and then the engineer sent a revision with a beam 260mm.
The ...
0
votes
1answer
55 views
Linear Motion Stage with Offset Loading Problem
I'm currently developing a linear motion system which will have to withstand a large offset load (see image below). There will be two rails, each with a carriage on, which will be connected by a beam/...
3
votes
2answers
81 views
Can you use an accelerometer to measure beam deflection under static loading?
With an appropriately collocated accelerometer is it possible to retrieve lateral deflection of a beam under static loading.
The beam will be loaded and then deflect until it reaches equilibrium with ...
2
votes
4answers
114 views
Swing safety: maximum load of beam (supported at one end, free with load on the other)
My husband and his dad built a fort for our two boys. Coming off of one side of the fort is a 4x6 wooden beam with a tire swing attached at the end. It is supported on one side by the fort, but not ...
-1
votes
1answer
534 views
How to plot bending moment diagram from shear force diagram
With conventions that I adopted shown below
I drew roughly the shear force and bending moment diagram of a simply supported beam with concentrated load at the middle. Now while drawing I drew both ...
-1
votes
1answer
78 views
Optimal placement of two support points along a wooden beam
Assuming a beam that is supported at 2 points as per attached image, what would be Lc (length center) and Lo (length overhang) for maximum strength. (or load bearing capability)
For actual material ...
-1
votes
1answer
41 views
Estimation of Beam Displacement from Acceleration
Hi Engineering Exchange,
I have a beam with pinned-pinned boundary conditions (free to rotate but not free to translate). A legacy computer analysis provided me with the maximum mid-span acceleration ...
18
votes
7answers
4k views
Is it structurally sound to cut an I beam to a T on one end?
I'd like to confirm whether the replaced beam in the attached picture is structurally sound given the end was cut to a T instead of an I. I had a qualified structural engineer approve the work but I'm ...
0
votes
1answer
95 views
Beam for shop gantry
I have a small machine shop and need to size a beam for a gantry crane. The design is a 4 post fixed design with 2 horizontal beams running parallel across the shop ends with 1 beam to be mounted ...
4
votes
2answers
77 views
Beam buckling criterion?
If I have an I beam which I subject to some bending load, how can I calculate when the thinner middle part of the I beam will buckle? I though I could use Euler's critical load formula here, but it's ...
2
votes
1answer
87 views
Limits of Euler-Bernoulli Beam Theory for Wide Plate in Flexure?
I'm looking for established limits or rules of thumb for the validity/accuracy of Euler-Bernoulli beam equations for particularly wide "beams". For example, a simply supported rectangular ...
